• 作者： 蔡雅惠; 陳瑞松
• 作者服務機構： 國立臺灣大學醫學院牙醫學系; 國立臺灣大學醫學院附設醫院牙科
• 中文摘要： 由於玻璃離子體充填材有較長之硬化過程，再加上此材料之性質對於水污染特別敏感，因此防濕裝置在此類材料之填補十分重要。本實驗之主要目的乃在探討早期遇水對玻璃離子體充填材表面粗度及表面硬度之影響；同時決定充填材應被隔濕的最短時間，並且比較三種受試材料在不同時問遇水時之硬化程度。 本實驗中所用之三種產品分別是Shofu Glaslonomer Cement Type II， GC Fuji II及ESPE Ketac-Fil將三種材料分別於調拌後5、10、15、20、30、60分鐘及24小時後置入室溫之水中，然後在37±2℃之水浴中儲存。七天之後分別測試各試體之表面粗度及硬度。 結果顯示，對所有的產品而言，五分鐘的硬化程度並不足以抵抗水的侵襲。至少要有十分鐘的防水時間才能得到一個較穩定的表面。根據表面粗度測驗顯示，Shofu黏合劑比Fuji II或是Ketac-Fil有較快之初期硬化。在表面硬度測驗方面，三種材料之硬度均隨著遇水時間之延後而增加。Shofu及Fuji II在二十四小時後才遇水之硬度較其他受試組顯著為高。十五分鐘之Ketac-Fil組，十五分鐘之Shofu組以及二十分鐘之Fuji II組均測得相似之硬度。 本實驗結果建議任何可以保持較長久之防濕效果的方法應被採用。
• 英文摘要： Glass ionomer cement has long been considered to be sensitive to moisture. As it is a slow settingmaterial, in the course of the setting process, it is susceptible of contamination by moisture in an oralenvironment. This would adversely affect its physical properties. Researchers have made every effort todevelop a faster setting material in order to improve the clinical performance of its restoration. The aimsof the present study were to investigate the detrimental effects of early water contamination on threeglass ionomer cements in terms of two parameters: surface roughness and surface hardness. In addition,the minimal periods of time required for the protection of newly mixed cements were determined and theextent of the setting reaction among three materials was compared. All the tested materials were prepared according to the manufacturers' instructions. The materialswere designed to be contaminated with water at 5,10, 15, 20, 30, 60 minutes, and 24 hours after com-mencement of mixing and then tested after 7 days. The results showed that 5-minute protection is not adequate to protect the specimens from waterattack. At least 10 minutes was required to attain a relatively stable surface for all three materials. Shofuglass ionomer cement seemed to have a faster initial set than did Fuji II and Ketac-Fil on the basis of theresults of the surface roughness test. The hardness values of the three materials invariably increased as theperiod of water-protection was prolonged. The average hardness values of the 24-hour Shofu group and 24-hour Fuji II group were significantly higher than those of many other groups. The 15-minute Ketao-Filgroup, 15-minute Shofu group, and 20-minute Fuji II group achieved similar hardness. The present study suggests that in restoration with glass ionomer cement, any available preventivemeasures should be employed to protect the material from moisture contamination as long as possible.
• 中文關鍵字： glass ionomer cements
• 英文關鍵字： --